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# CompletionHandler

`public interface CompletionHandler`
``

java.nio.channels.CompletionHandler<V, A>

A handler for consuming the result of an asynchronous I/O operation.

The asynchronous channels defined in this package allow a completion handler to be specified to consume the result of an asynchronous operation. The `completed` method is invoked when the I/O operation completes successfully. The `failed` method is invoked if the I/O operations fails. The implementations of these methods should complete in a timely manner so as to avoid keeping the invoking thread from dispatching to other completion handlers.

## Summary

### Public methods
`abstract void` | `completed(V result, A attachment)` Invoked when an operation has completed.
`abstract void` | `failed(Throwable exc, A attachment)` Invoked when an operation fails.

## Public methods

### completed

    public abstract void completed (V result,
                    A attachment)

Invoked when an operation has completed.

Parameters
`result` | `V`: The result of the I/O operation.
`attachment` | `A`: The object attached to the I/O operation when it was initiated.

### failed

    public abstract void failed (Throwable exc,
                    A attachment)

Invoked when an operation fails.

Parameters
`exc` | `Throwable`: The exception to indicate why the I/O operation failed
`attachment` | `A`: The object attached to the I/O operation when it was initiated.

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